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Hi Frank,

I think you are talking about the Hull Identification Number (HIN #). The manufacturer must affix two such numbers to the hull and usually one is stamped into the gelcoat on the starboard outboard transom with the other on a fixed member of the hull beneath a fitting, generally in the engine room or on the mast base of a sailboat. Here's a link that tells you everything you need to know - - click HERE

The following is an excerpt from the actual regulations Coast Guard Department of Transportation; CGD 79-013, 48 FR 40718.

Sec. 181.23—Hull identification numbers required
(a) A manufacturer (or importer), as defined in Sec. 181.3 of this part, must identify each boat produced or imported with two hull identification numbers that meet the requirements of this subpart:

(1) A primary hull identification number affixed in accordance with Secs. 181.29(a) and (c) of this subpart; and

(2) A duplicate hull identification number affixed in accordance with Secs. 181.29(b) and (c) of this subpart.

Look carefully at the top of the starboard transom, you should find the HIN number there, unless the hull has been painted or repaired in a way that obscures the HIN number. It should be within two inches of the deck joint.

Hope this helps.

Best,

Captain Mike Clayton

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Hi Frank,

Ahh yes, the documentation number is different than the HIN number, my mistake. Your certificate of documentation will have your documentation number on it. It is up to the owner to then affix that number in the format No. XXXXXXX to a permanent and highly visible structural member of the boat. Usually, the number is routed into a header board above the navigation station, or a companionway. You certainly shouldn't have to look for 40 minutes - - that means the owner either never had the number mounted, or took it with him when he sold the boat to your friend. In either case, your friend should do exactly what you said - - affix the number in a permanent and visible area.

All the best,

Mike